Multiple Choice
Which type of cells in the human body are primarily targeted and attacked by HIV?
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10. Cell Signaling
Introduction to Cell Signaling
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Which of the following is an example of a dynamic process in cell signaling?
A
Phosphorylation of a protein in response to a signaling molecule
B
The fixed sequence of DNA in the nucleus
C
The static structure of the plasma membrane
D
The constant number of ribosomes in a cell
Verified step by step guidance1
Understand the concept of cell signaling: Cell signaling is a dynamic process where cells communicate with each other through signaling molecules, leading to changes in cellular activity.
Identify the dynamic process: A dynamic process involves changes or modifications in response to external or internal stimuli. Phosphorylation of a protein is an example of such a process because it modifies the protein's activity in response to a signaling molecule.
Eliminate static processes: The fixed sequence of DNA in the nucleus, the static structure of the plasma membrane, and the constant number of ribosomes in a cell are examples of static processes or structures that do not change dynamically in response to signaling.
Focus on phosphorylation: Phosphorylation is a reversible and regulated process where a phosphate group is added to a protein by a kinase enzyme, altering the protein's function, activity, or location. This is a hallmark of dynamic signaling.
Conclude that phosphorylation is the correct example: Based on the dynamic nature of phosphorylation in response to signaling molecules, it is the correct answer to the question.
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